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Orthogonality relations of Crouzeix-Raviart and Raviart-Thomas finite element spaces (2005.02741v1)
Published 6 May 2020 in math.NA and cs.NA
Abstract: Identities that relate projections of Raviart-Thomas finite element vector fields to discrete gradients of Crouzeix-Raviart finite element functions are derived under general conditions. Various implications such as discrete convex duality results and a characterization of the image of the projection of the Crouzeix-Ravaiart space onto elementwise constant functions are deduced.
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